The stock soared 20 per cent to settle at Rs 4.50 - also its highest trading permissible limit for the day - on BSE.
At NSE, shares of the company zoomed 20 per cent to close at Rs 4.50.
More than a decade after it declined to take a stake in Nagarjuna Group's refinery in Tamil Nadu, IOC is looking at buying equity stake in its Cuddalore refinery.
IOC has held preliminary discussions on a possible equity stake in the project, highly placed sources said.